Index symlinks by replacing tryGetRealName with getName+normalization

Fix #639

Author: MaskRay

src/clang_tu.cc

@@ -17,13 +17,13 @@
 #include <llvm/Support/Path.h>
 
 using namespace clang;
+using namespace llvm;
 
 namespace ccls {
 std::string pathFromFileEntry(const FileEntry &file) {
-  StringRef name = file.tryGetRealPathName();
-  if (name.empty())
-    name = file.getName();
-  std::string ret = normalizePath(name);
+  SmallString<128> path(file.getName());
+  sys::path::remove_dots(path, /*remove_dot_dot=*/true);
+  std::string ret(path.str());
   // Resolve symlinks outside of workspace folders, e.g. /usr/include/c++/7.3.0
   return normalizeFolder(ret) ? ret : realPath(ret);
 }

src/messages/initialize.cc

@@ -348,17 +348,16 @@ void do_initialize(MessageHandler *m, InitializeParam &param,
     std::string path = wf.uri.getPath();
     ensureEndsInSlash(path);
     std::string real = realPath(path) + '/';
-    workspaceFolders.emplace_back(path, path == real ? "" : real);
+    workspaceFolders.emplace_back(path, real);
   }
   if (workspaceFolders.empty()) {
     std::string real = realPath(project_path) + '/';
-    workspaceFolders.emplace_back(project_path,
-                                  project_path == real ? "" : real);
+    workspaceFolders.emplace_back(project_path, real);
   }
   std::sort(workspaceFolders.begin(), workspaceFolders.end(),
             [](auto &l, auto &r) { return l.first.size() > r.first.size(); });
   for (auto &[folder, real] : workspaceFolders)
-    if (real.empty())
+    if (real == folder)
       LOG_S(INFO) << "workspace folder: " << folder;
     else
       LOG_S(INFO) << "workspace folder: " << folder << " -> " << real;

src/utils.cc

@@ -139,7 +139,7 @@ std::string realPath(const std::string &path) {
 
 bool normalizeFolder(std::string &path) {
   for (auto &[root, real] : g_config->workspaceFolders)
-    if (real.size() && llvm::StringRef(path).startswith(real)) {
+    if (StringRef(path).startswith(real)) {
       path = root + path.substr(real.size());
       return true;
     }